Rep. Erik Paulsen, R-Minnesota, still has the advantage, but his race is getting tighter. (Tom Williams/CQ Roll Call file photo)

On the eve of the conventions, with Republicans poised to nominate reality show celebrity Donald Trump as their presidential nominee, we’re still waiting for the bottom to drop out of the election for the GOP and jeopardize dozens of House seats.

Thus far, the universe of House battleground districts has been fairly static. Democrats claim they are adding seats to the competitive map, but many of those are districts they haven’t contested in years and finally have a warm body to run in.

Democrat Shelli Yoder and Republican Trey Hollingsworth begin their general election race in Indiana’s 9th District with equal support, according to internal polling from the Yoder campaign.

Both candidates start with 41 percent of the vote, with 18 percent undecided in the race for a seat in a now solidly Republican district. The Rothenberg & Gonzales Political Report/Roll Call rates the seat Safe Republican.

Indiana state Sen. Erin Houchin is one of five candidates running in the state's 9th District Republican primary. (Tom Williams/CQ Roll Call)

In Indiana’s competitive 9th Congressional District Republican primary race, there’s a big spender. A really big spender. His name is Joseph A. “Trey” Hollingsworth III (Roll Call has already delved into other oddities about his candidacy, like how he’s from Tennessee ), and he’s been blanketing the airwaves with campaign ads in the five-way race for GOP Rep. Todd Young’s open seat — which is rated Safe Republican by the Rothenberg & Gonzales Political Report/Roll Call. There are unique challenges in the contest, like how no one in his adopted hometown of Jeffersonville has really seen him outside of their TV screens, but money isn’t one of them.

[Rothenberg & Gonzales/Roll Call Race Ratings map] Tuesday's Democratic primary in Maryland's 8th District also featured a big spender. In the race for Rep. Chris Van Hollen's seat, rated Safe Democrat , Potomac wine businessman David Trone became the largest self-funded House candidate ever. But he lost to American University constitutional law professor/state Sen. Jamie Raskin, who was the third-biggest spender in the race.